Tool holder



N. P. DARASH TOOL HOLDER Aug. 13, 1940.

Filed March 26, 1938 Patented Aug. 13, 1940l PATENT OFFICE TOOL HOLDER Nicholas P. Darash, Cleveland, Ohio, assignor to The Warner & Swasey Company, Cleveland, Ohio, a corporation of Ohio Application March 26,

Claims.

An object of the invention is tor provide an improved tool holder of the character specified,

5 which is so constructed that when the adjustable tool carrying portion thereof is clamped in adjusted position it possesses extreme rigidity and strength, thus enabling the holder to have full capacity for assuming the thrust of the cutting tool without deection due to any springing action or relative movement of the parts.

Another object is to provide in an improved tool holder an adjustable gib forming-a portion of the guideway for the tool carrying slide and which gib is so mounted that it will remain in position in the guideway when the slide is removed therefrom and can be adjusted relative to the slide so as to cause the guideway to have the correct dimensions to impart stability to the slide but allow for its adjusting movement in the guideway.`

A further object is to provide a gib for the guideway for the adjustable slide of a tool holder and which is so mounted in the tool holder that it-can be adjusted to function as a gib for the slide or as a clamp for the slide to hold the latter rigidly in its adjusted position.

Another object is to provide a tool holder wherein the body is offset with respect to the shank and also wherein the adjustable tool carrying slide and the means for adjusting said slide can be reversibly positioned with respect to the body to thus position the cutting edge of the tool at various distances from the longitudinal center line of the shank of the holder.

Further and additional objects and advantages not hereinbefore specified will become apparent hereinafter during the following detailed description of an embodiment of the invention.

Referring to the accompanying drawing illustrating such embodiment of the invention,

Fig. l is a plan view of the improved tool holder.

Fig. 2 is a fragmentary plan view of the tool holder with the adjustable tool carrying slide and adjusting screw removed from the body.

Fig. 3 is a fragmentary sectional view of the tool holder as shown in Fig. 1, and is taken substantially on line 3 3 of Fig. 1 looking in the direction of the arrows.

Fig. 4 is a view similar to Fig. 3 but showing the tool carrying slide and the adjusting means therefor in the reverse position. j

Fig. 5 is a sectional view through the body showingthe adjustable gib or clamp in elevation 1938, Serial No. 198,282

and is taken substantially on line 5--5 of Fig. 2 looking in the direction of the arrows, and

Fig. 6 is a fragmentary' side elevation of the tool holder shown in Fig. l and is taken looking from the left hand side of said ligure. 5

The improved tool holder comprises a shank I0 by means of which the holder is mounted in a suitable part of the machine tool, such as a turret or another tool holder applied to a turret or in any other desired part or attachment of the 10 machine tool. A body II is located at one end of the shank I0 and preferably is formed integral therewith and reference to Figs. 3 and 4 will show` that said body II is oiset with respect to the longitudinal center line of the shank for a pur- 15 pose later to be made clear. The body I I is provided with a transversely extending recess I2 which is so shaped as to form with an adjustable wedge-shaped gib or clamp I3 a dove-tail guideway for the adjustable tool carrying slide I4 that 20 is provided with a dove-tail portion I5 slidably mounted in the recess I2. At one end of the slide I4 the dove-tail portion I5 has a portion I6` extending at right angles thereto and provided at its free end with a fork adapted to straddle the 25 body portion of an adjusting screw I1 and lying intermediate an integral iiange I8 formed on said screw and a micrometer head I9 at the outer end of the screw, as clearly indicated in Fig. 3. The screw I'I is threaded into an opening 2li formed o in the body II and the integral flange I8 projects into a complementary recess in the body at either end of the threaded opening 20 when the slide is in its most inward-position.

It will be seen that when the screw I1 is turned inwardly or outwardly of the opening 20 the slide I4 will be moved in its guideway, due to the fork of the portion I6 lying between the flange I8 and the micrometer head I9, and consequently the slide I4 can be accurately adjusted or positioned as desired with respect to the body II by bringing the indicia of the micrometer head into line with a xed pointer line 2| formed on the portion I6. g It will also be noted that the slide I4 and theadjusting screw II can be removed ,from the body 45 and the slide and screw reversely positioned on the body as indicated in Fig. 4 and that the screw I1 in this new position of the slide extends into the threaded opening 20 in the body, while the 1 flange I8 projects into the complementary recess in the other end of the opening when the slide is in its most inward position.

' The slide I4 is provided with a tool receiving opening 22 that extends, in this instance, at an 55 acute angle to the longitudinal center line of the shank and a tool, indicated at 23 by dash lines, can be clamped in said opening by suitable clamping screws 24. It will be understood that the tool 23 can be longitudinally adjusted to various positions in the opening 22.

It will also be noted thatsince the body II is oil'set with respect to the longitudinal center line of the shank It and the slide I4 can be reversed with respect to the body II, the cutting ed of the tool has a range of adjustments at a greater distance from the longitudinal center` line of the shank when the slide is positioned as shown in Fig. 3, than it has when the slide is positioned as shown in Fig. 4. This arrangement of oifsetting the body with respect to the longitudinal center line of the shank and having the slide Vreversible on the body results in doubling the range of adjustability of the cutting edge of the tool with relation to the longitudinal center line of the shank, and, of course, with relation to the Work piece to be machined.

As previously stated, a tapered or wedge-shaped gib or clamping member I3 forms one side of the dove-tail guideway I2 of the body member II and said gib I3 extends the full length of the body. The gib I 3 is held in position in the guideway and against endwisemovement therein by means of a screw 25 secured to the gib substantially midway of its ends and having its head portion located in a recess formed in the body member II. A spring 26 surrounds the screw 25 intermediate its head and the bottom of the recess in the body and acts to hold the gib I3 under spring tension against the abutting ends of adjusting or clamping screws 21 which are arranged in threaded openings formed in the body Il and located on opposite sides of the screw 25.. A

As previously stated, the gib I3 forms part of the dove-tailv recess or guideway and when the tool carrying slide I4 `1s being adjusted by the screw I 1 the adjusting screws 21 are so positioned that the gib i3 will be located correctly to allow the slide to move freely in the guideway and Without any looseness. In other words, during the time that the slide I4 is being adjusted the gib I3 can be positioned by adjusting the screws 21 to form a perfect guideway for the slide, wherefore the cutting tool can be brought to the correct location, and then when the slide is clamped in position the location of the cutting edge of the tool will not be materially changed.

As soon as the slide and cutting tool have been correctly positioned by the rotation of the screw I1 the screws 21 are then turned to force the Wedge-shaped gib or clamping member I3 inwardly of the guideway or recess I2, with the result that the slide I4 and the portion I5 thereof are held tightly against the body member with a metal to metal surface contact.

It will be seen that the Wedging action of the gib I3 when placed in clamping position by the screws 21 causes the slide Il and the portion I5 thereof to tightly engage @he body member II atIIa, IIb and IIc and said portion I5 of the slide also tightly engages the gib I3 at Ila (see Fig. 1). Due to the four point contact of the slide with the body, as just explained, the slide, when the body II and the slide Il form a convergent or. V-shaped space in which the gib Il is located. It will also be seen that the gib itself is of substantially triangular cross-sectional shape and that the wedge faces corresponding with two sides of the triangle cooperate with the convergent faces of the V-space. The face of the gib corresponding with the third side or base of the triangle is disposed so that the clamping screws 21 may act thereon.v within the angle included by the wedge faces, to produce the desired wedging action.

It will be noted further that when the slide I4 and the adjusting screw i1 are removed to vary the position of the slide and screw with respect to the body II, the gib I3 does not fall out but remains in position due to the screw 25 and the spring 25 acting thereon holds the gib against the screws 21. The screw 25 also holds the gib Il inV proper position longitudinally of the guideway. Consequently when the slide is again mounted on the body in its new position the gib I3 has remained in its correct position to enable the slide to have a free but steady sliding movement in the lguideway or recess so that the cutting tool can be readily and accurately positioned in its new location.

It will also be recalled that since the body II is offset with respect to the longitudinal center line of the shank I0, a large range of adjusted positions of the cutting edge of the tool in relation to the longitudinal center line of the shank or to a work piece can be obtained by inverting the slide from one position to the other as shown in- Figs. 3 and 4. l

Although a preferred embodiment of the invention has been illustrated and described herein, it will be understood that the invention is susceptible of various modifications and adaptations within the scope of the appended claims.

Having thus described my invention I claim:

1. A tool holder comprising a shank, a body at one end of the shank and offset with respect to the axis thereof, a slide mounted on said body and provided with an opening arranged at an acute angle to the axis of said shank and adapted to receive a cutting tool, and a screw for adjusting said slide, said body being provided with a threaded opening to receive said screw from either end thereof whereby said slide can be reversibly positioned on said body and said screw can effect an adjustment thereof in either of said positions.

2.- A tool holder comprising a shank, a body at one end of said shank and offset with respect to the axis thereof and provided with a guideway, a slide mounted in said guideway, a wedge-shaped gib in said guideway, means securing said gib to said body under spring tension, means for moving said gib against said spring tension to wedge said slide in said guideway, and an adjusting screw for said slide, said body being provided with a threaded opening for receiving said screw from either end thereof whereby said slide can be reversibly mounted in said guideway and adjusted therein by said screw.`

3.A tool holder comprising a body provided with a guideway, a member slidable in said guideway, adjacent portions of said body and member dening a V-like recess, a gib of substantially triangular cross-section in said recess and having wedge faces changeable with the sides of the V-recess and a third face corresponding with the base of the triangular cross-section, and means adapted to cooperate with said third face of the gib for moving. the some to cause a wedgingV action o'r clamping said member'and body together. 4. A tool holder comprising a body provided with a guideway, a member slidable in said guidebase of the triangular cross-section, means adapted .to cooperate with said third face of the gib for moving the same to vcause a. wedging 4action for clamping said member and body together, a screw holding the gib against longitudinal movement in said recess, and a spring acting on the screw to urge the gib toward a nonwedgingl position.

5.a tool holder comprising a. body provided with a guideway, ajmemberislidable in said guideway, adjacent portions ofsaid and member vdening a V-'like recess, a gib of substantially triangular cross-section in said recess and having wedge faces engageable with the. sides of the v-recess and a third face corresponding with the base of the triangular cross-section, a. pairl of screws on' said body engageable with said third face of the gib at longitudinally spaced points for moving the gib in a wedging direction to clamp said member and body together. and

spring tension means acting on the gib betweenv said screws for moving the gib in a' non-wedging direction and holding the same in engagement with said screws.

' NICHOLAS P; DARASH.

CERTIFICATE 0F CORRECTION.'

Patent No.' 2,211,596. August 15,'191Lo.

NICHOLAS P. DARASH.

It is hereby certified that error appears in the printed specification of the above numbered patentV requiring correction as follows: Page 2., sec- A on@- -column, line 72, claim 5, for the word Changeable read -engageab1e;

v and that the said Letters Patent should be read with this correction therelin that the saune may conform to the record of the case in the Patent 0f.-

fice.

Signed and sea1e`d this 17th day of September, A. D. 19L|.O.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

